I know for me personally, I work full time in a high stress environment. After working all week, doing housework on the weekends, listening to STBX talk, cooking etc., all I could think about were naps - sex was often the last thing on my mind.
There were times when STBX was in the mood and I just wanted to go to sleep so I could be rested for work the next day!
I know something that would have worked for me would have been to come home and find all of the housework done, a nice romantic dinner, candles, a massage... Maybe if you surprise your W so that when she comes home one evening, she has nothing else to worry about - maybe she will have the mental energy to think about making love to you. When us women have a million responsibilities running around in our heads, our sex drive does tend to go into low gear.
BTW - I cannot speak for all women, but most of my friends and I - we prefer silk boxers on our men!